Posted by **Larry English** on Friday, September 9, 2011 at 9:10pm.

1. The mean and standard deviation of the grades of a group of students who took an economic exam were 69 and 7, respectively. The grades have a mound-shaped distribution. According to the Empirical Rule,

a) Approximately 68% of the grades were between which grade?

b) Approximately what percentage of grades were between 55 and 76?

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